refactor(price): improve handling of other ratios in PriceData

relay/image_handler.go

@@ -128,7 +128,7 @@ func ImageHelper(c *gin.Context, info *relaycommon.RelayInfo) (newAPIError *type
 	// Adaptors may have already set a more accurate count from the
 	// upstream response; only set the default when they haven't.
 	if info.PriceData.UsePrice { // only price model use N ratio
-		if _, hasN := info.PriceData.OtherRatios["n"]; !hasN {
+		if !info.PriceData.HasOtherRatio("n") {
 			info.PriceData.AddOtherRatio("n", float64(imageN))
 		}
 	}